Thomas bobebtson



(No Model.)

T. ROBERTSON. Process of ManufaoturingLozenges. No. 233,157. PatentedFeb. '22, 1881.

UNITED STATES PATENT OFFIcE.

THOMAS ROBERTSON, OF TORONTO, ONTARIO, CANADA.

PROCESS OF MANUFACTURING LOZENGES.

SPECIFICATIONfOrming part of Letters Patent No. 238,157, dated February22, 1881.

Application filed April 6, 1880.

To all whom it may concern:

Be it known that I, THOMAS ROBERTSON, of Toronto, in the county of York,and Province of Ontario, Canada, have invented certain new and usefulImprovements in Methods of Manufacturing Lozenges; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had'to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

The object of my invention is to facilitate the manufacture of lozengesfrom a thin sheet of material, and at the same time to produce, as a newarticle of manufacture, a lozenge which possesses certain advantagesOver those heretofore made, as will be hereinafter fully explained.

In the drawings, Figure l is a vertical section of a die which I proposeto use in cut ting the lgzenge from a continuous strip or sheet ofmaterial of the proper thickness. Fig. 2 is a vertical section of dieswhich I propose to use in completing the lozenge according to myimproved method. Figs; 3 and 4 represent lozenges in section.

This invention is an improvement upon that shown in Patent N 0. 153,018,granted me July 14, 1874:, and in carrying out my invention I propose touse the machine therein shown and described, except that I dispense withthe revolving cutters O and the mechanism for r0 tating said cutters andsubstitute therefor the dies shown at Fig. 2 on these drawings.

In preparing the material from which to make my lozenges I use anywell-known formulas-as, for instance, I may take one hundred pounds ofsugar, twelve ounces of gumtragacanth, eighteen pounds glucose, andsufficient water to reduce the mass to a pulp of the desiredconsistency, adding such flavoring-extracts or coloring-matter, or both,as I may find desirable. The ingredients are thoroughly incorporated andreduced to the form of a thin sheet by any of the usual or approvedmodes of manipulation. I then, by

means of a cutting-die, as represented in Fig.

(No model.)

1, out from the thin sheet blanks for lozenges in the usual form-that isto say, circular-and of uniform thickness.

As seen in Fig. 2 my compressing or shaping dies consist of a shank, A,and a concave working-face, A, two dies being employed, one to engagewith each face of the lozen The lozenges, after being cut into the formindicated at Fig. 3, are placed in proper position between the opposingends of the dies A A, which dies are then advanced toward each other,and as they engage with the outer edges of the lozenge, it (the lozenge)is molded into the shape shown in Fig. 4. It will readily be understoodthat by this operation I have materially increased the density andfirmness of the lozenge at its outer peripher and that in consequencethereof it can be transferred to the pan and finished with a thincoating of sirup much sooner than could be done had it not beensubjected to the compression of the dies A A, because its increasedfirmness permits its being handled in the pan without liability ofhavingits edges broken or injured.

Another advantage which is due to this method of manufacture is this:The lozenge has a smoother exterior than it would otherwise have, andis, by reason of this additional compression at its edges, less liableto fracture during such handling as it is necessarily subjected to inpacking for market and during transportation.

While I have described but one method of carrying out my invention, I donot wish to be limited to the employment of the specific devices or theprecise mode of manufacture which I have indicated, as other means mightbe employed for compressing the edge ofthe lozenge and imparting theretothe desired firmness; as, for instance, the dies A A might be employedto stamp the lozenge from a sheet of material of uniform thickness atone operation, or one die or a series of dies might be employed inconnection with a bed-plate or matrix having suitable-shaped cavities inits face in such relation to the die or dies as to accomplish the sameresult, without departing from the spirit of that part of my inventionwhich relates to the production of a lozenge stantially uniformthickness throughout, next 10 having portions contiguous to its edge ofgreatcompressing edges of the blanks, substantially er density than thecentral portion. as set forth.

WhatI claim is-- In testimony that I claim the foregoing I 5Theherein-described method of manufacturhave hereunto set my hand.

in g lozengesthat is to say, first forming the THOMAS ROBERTSON.material into a sheet of substantially uniform Witnesses: thickness,next forming from the sheet blanks GEO. A. MILNE,

which are circular in plan View and of sub- JNO. H. UNDERHILL.

